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Shared from Motion - III on Oct 14, 2020 7:49 PM

A car is moving with a speed of 20 m/s. When brakes are applied, it stops in 10 seconds. Retardation produced by the brakes is ______.

 
4 ms-2
2 ms-2
8 ms-2
20 ms-2

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Retardation = speed/time , sign convention ( + for acceleration and - for retardation ).so Retardation = -20/10 m/s/time (in s)=-2 m/s2

The answer of this should be -2 m/s